A chargeable communication module is provided, which includes: a wireless power charging coil; a wireless communication coil being electrically isolated from the wireless power charging coil; and a magnetic body. The wireless power charging coil is disposed on a surface of the magnetic body. The wireless communication coil is arranged peripheral to the wireless power charging coil on the surface of the magnetic body.
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22. A chargeable communication module having a plane and a thickness direction extending perpendicularly to the plane, the module comprising:
a wireless power charging coil;
a wireless communication coil being electrically isolated from the wireless power charging coil; and
a magnetic sheet;
wherein the wireless power charging coil is disposed on a surface of the magnetic sheet, and
the wireless communication coil is arranged peripheral to the wireless power charging coil on the surface of the magnetic sheet.
1. A chargeable communication module having a plane and a thickness direction extending perpendicularly to the plane, the module comprising:
a wireless power charging coil;
a wireless communication coil being electrically isolated from the wireless power charging coil;
a first magnetic sheet; and
a second magnetic sheet,
wherein the first magnetic sheet, the wireless power charging coil, the second magnetic sheet, and the wireless communication coil are disposed in this order in the thickness direction of the module, and
the wireless power charging coil and the wireless communication coil at least partially overlap each other in the thickness direction of the module.
15. A chargeable communication module having a plane and a thickness direction extending perpendicularly to the plane, the module comprising:
a wireless power charging coil;
a wireless communication coil being electrically isolated from the wireless power charging coil;
a first magnetic sheet having a first permeability; and
a second magnetic sheet having a second permeability different from the first permeability,
wherein the wireless power charging coil is arranged on a surface of the first magnetic sheet,
the second magnetic sheet is arranged peripheral to the wireless power charging coil on the surface of the first magnetic sheet, and
the wireless communication coil is arranged on a surface of the second magnetic sheet.
8. A chargeable communication module having a plane and a thickness direction extending perpendicularly to the plane, the module comprising:
a wireless power charging coil;
a wireless communication coil being electrically isolated from the wireless power charging coil;
a first magnetic sheet having a first permeability; and
a second magnetic sheet having a second permeability different from the first permeability,
wherein the wireless power charging coil is arranged on a surface of the first magnetic sheet in the thickness direction of the module and the wireless communication coil is arranged on a surface of the second magnetic sheet in the thickness direction of the module,
the second magnetic sheet is arranged peripheral to the first magnetic sheet in the plane of the module, and
a first boundary surface between the wireless power charging coil and the first magnetic sheet is offset from a second boundary surface between the wireless communication coil and the second magnetic sheet in the thickness direction of the module.
2. The chargeable communication module according to
wherein a permeability of the first magnetic sheet is greater than a permeability of the second magnetic sheet.
3. The chargeable communication module according to
wherein a resonance frequency of the wireless power charging coil is lower than a resonance frequency of the wireless communication coil.
4. The chargeable communication module according to
wherein at least a portion of the wireless communication coil overlaps an outer circumference of the wireless power charging coil.
5. The chargeable communication module according to
wherein at least a portion of the wireless communication coil is disposed outside the wireless power charging coil.
7. The chargeable communication module according to
9. The chargeable communication module according to
wherein a thickness of the second magnetic sheet with respect to a thickness of the first magnetic sheet is set such that the first boundary surface is offset from the second boundary surface in the thickness direction of the module.
10. The chargeable communication module according to
wherein a position regulator that regulates a position of the second magnetic sheet in the thickness direction of the module is arranged on a surface of the second magnetic sheet opposite to the surface on which the wireless communication coil is arranged, and
a thickness of the position regulator is set such that the first boundary surface is offset from the second boundary surface in the thickness direction of the module.
11. The chargeable communication module according to
12. The chargeable communication module according to
wherein a resonance frequency of the wireless power charging coil is lower than a resonance frequency of the wireless communication coil.
14. The chargeable communication module according to
16. The chargeable communication module according to
wherein a resonance frequency of the wireless power charging coil is lower than a resonance frequency of the wireless communication coil.
17. The chargeable communication module according to
a guide that sets a distance between the wireless power charging coil and the wireless communication coil in the plane of the module to be equal to or greater than a predetermined value.
18. The chargeable communication module according to
wherein the guide is formed integrally with the second magnetic sheet.
19. The chargeable communication module according to
a substrate which is arranged peripheral to the wireless power charging coil and having a surface on which the wireless communication coil is formed as a predetermined metal pattern,
wherein the guide is formed integrally with the substrate.
20. The chargeable communication module according to
wherein the first permeability of the first magnetic sheet is greater than the second permeability of the second magnetic sheet.
21. The chargeable communication module according to
23. The chargeable communication module according to
24. The chargeable communication module according to
25. The chargeable communication module according to
a substrate on which the wireless communication coil is arranged;
wherein the wireless communication coil is interposed between the substrate and the surface of the magnetic sheet.
26. The chargeable communication module according to
a first shortest distance between the wireless power charging coil and the wireless communication coil at the corner portion is greater than a second shortest distance between the wireless power charging coil and the wireless communication coil at one of the sides.
27. The chargeable communication module according to
28. The chargeable communication module according to
29. The chargeable communication module according to
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The present invention relates to a non-contact wireless communication coil which can perform non-contact power transmission and non-contact wireless communication and a portable wireless terminal including the non-contact wireless communication coil.
For example, portable wireless terminals including mobile phone terminals and smart phones which have a non-contact wireless communication (so-called radio frequency identification (RFID)) function, such as a near field communication (NFC) function including FeliCa (registered trademark), are being widespread. For example, an electronic money function and a ticket function are implemented by this type of non-contact wireless communication.
In addition, in recent years, a portable wireless terminal with a function of transmitting power in a non-contact manner to change a battery (non-contact charging) has been in use. Examples of the non-contact power transmission type include an electromagnetic induction type and a magnetic field resonance type. In general, a coil in a power supplier is opposite to a coil in a power receiver to transmit power.
In the portable wireless terminal with the non-contact charging function, in general, a charging coil is integrated with a battery pack. Therefore, if the battery pack is thinned in order to reduce the thickness of the terminal, battery capacity is reduced. In contrast, if the charging coil is provided separately from the battery pack, it is necessary to solve the problems caused by the coexistence of the charging coil with a non-contact wireless communication coil in the portable wireless terminal with the non-contact wireless communication function.
Here, it is assumed that the non-contact wireless communication coil and the non-contact power transmission coil coexist. As the related art in which two coils are provided, for example, PTL 1 discloses a wireless card in which a first coil forming an antenna for power waves and a second coil forming an antenna for data waves are arranged so as to form a double ring. According to this structure, the first coil and the second coil are less likely to be covered with the fingers of the hand which holds the wireless card and it is possible to make the reception conditions of the two coils substantially equal to each other.
[PTL 1] JP-A-2004-110854
In the structure disclosed in PTL 1, since two coils are arranged so as to form a double ring, the arrangement area of the coils is large. In addition, when a plurality of coils are simply arranged in parallel, without considering the performance of each coil, performance deterioration due to electromagnetic coupling between the coils is expected. In particular, when a plurality of coils are arranged close to each other in order to reduce the size of the terminal provided with the coils, performances, such as power transmission efficiency and a communication distance, deteriorate due to the electromagnetic coupling between the coils.
The invention has been made in view of the above-mentioned problems and an object of the invention is to reduce a size while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist.
The present invention provides a non-contact wireless communication coil including: a first coil; a second coil; a first magnetic body; and a second magnetic body, wherein the first magnetic body, the first coil, the second magnetic body, and the second coil are laminated in this order in a thickness direction of the coils, and the first coil and the second coil at least partially overlap each other.
According to the above configuration, when a plurality of coils coexist, it is possible to reduce electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since a plurality of coils are arranged so as to be laminated, it is possible to reduce an arrangement area and to achieve a small coil with small performance deterioration.
Further, the present invention includes the above non-contact wireless communication coil, wherein a permeability of the first magnetic body is greater than a permeability of the second magnetic body.
Further, the present invention includes the above non-contact wireless communication coil, wherein a resonance frequency of the first coil is lower than a resonance frequency of the second coil.
Further, the present invention includes the above non-contact wireless communication coil, wherein at least a portion of the second coil overlaps an outer circumference of the first coil.
Further, the present invention includes the above non-contact wireless communication coil, wherein at least a portion of the second coil is disposed outside the first coil.
Further, the present invention includes the above non-contact wireless communication coil, wherein the first coil is used for non-contact power transmission and the second coil is used for non-contact wireless communication.
Further, the present invention provides a portable wireless terminal including any one of the above non-contact wireless communication coils.
The present invention is a transmission coil including: a first coil; a second coil; a first magnetic body with a predetermined permeability; and a second magnetic body with a permeability different from the predetermined permeability of the first magnetic body, wherein the first coil is arranged on a surface of the first magnetic body and the second coil is arranged on a surface of the second magnetic body in a thickness direction of the coils, the second magnetic body is arranged in an outer circumference of the first magnetic body in a plane direction of the coils, and a first boundary surface between the first coil and the first magnetic body is substantially flush with a second boundary surface between the second coil and the second magnetic body, or the second boundary surface is higher than the first boundary surface in the thickness direction of the coils.
According to the above configuration, when a plurality of coils coexist in a housing, it is possible to reduce electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since a plurality of coils are arranged in parallel to each other, it is possible to simply reduce a thickness of the housing.
Further, the present invention includes the above transmission coil, wherein a thickness of the second magnetic body with respect to a thickness of the first magnetic body is set such that the first boundary surface is substantially flush with the second boundary surface or the second boundary surface is higher than the first boundary surface in the thickness direction of the coils.
Further, the present invention includes the above transmission coil, wherein a position regulation member that regulates a position of the second magnetic body in the thickness direction of the coils is arranged on a surface of the second magnetic body opposite to the surface on which the second coil is arranged, and the sum of the thickness of the second magnetic body and a thickness of the position regulation member with respect to the thickness of the first magnetic body is set such that the first boundary surface is substantially flush with the second boundary surface or the second boundary surface is higher than the first boundary surface in the thickness direction of the coils.
Further, the present invention includes the above transmission coil, wherein the permeability of the first magnetic body is greater than the permeability of the second magnetic body.
Further, the present invention includes the above transmission coil, wherein a resonance frequency of the first coil is lower than a resonance frequency of the second coil.
Further, the present invention includes the above transmission coil, wherein the first coil is used for non-contact power transmission and the second coil is used for non-contact wireless communication.
Further, the present invention is a portable wireless terminal including any one of the above transmission coils.
The present invention is a transmission coil including: a first coil; a second coil; a first magnetic body with a predetermined permeability; and a second magnetic body with a permeability different from the predetermined permeability of the first magnetic body, wherein the first coil is arranged on a surface of the first magnetic body, the second magnetic body is arranged outside the first coil on the surface of the first magnetic body, and the second coil is arranged on a surface of the second magnetic body.
According to the above configuration, when a plurality of coils coexist, it is possible to reduce electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since a plurality of coils are arranged close to each other, it is possible to reduce an arrangement area and to simply manufacture a small coil with low performance deterioration.
Further, the present invention includes the above transmission coil, wherein the permeability of the first magnetic body is greater than the permeability of the second magnetic body.
Further, the present invention includes the above transmission coil, wherein a resonance frequency of the first coil is lower than a resonance frequency of the second coil.
Further, the present invention includes the above transmission coil further including: a guide portion that performs guidance such that a distance between the first coil and the second coil is equal to or greater than a predetermined value.
Further, the present invention includes the above transmission coil, wherein the guide portion is formed in a circumferential portion of the second magnetic body on a first coil side.
Further, the present invention includes the above transmission coil further including: a substrate which is arranged outside the first coil and on which the second coil is formed as a predetermined metal pattern, wherein the guide portion is also formed in a circumferential portion of the substrate on a first coil side.
Further, the present invention includes the above transmission coil, wherein the first coil is used for non-contact power transmission and the second coil is used for non-contact wireless communication.
Further, the present invention is a portable wireless terminal including any one of the above transmission coils.
According to the present invention, it is possible to reduce a size while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist.
According to the present invention, it is possible to simply reduce the thickness of the housing while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist in the housing.
According to the present invention, it is possible to simply manufacture a small coil while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist.
Sections (A) and (B) of
Sections (A) and (B) of
Sections (A) to (D) of
Sections (A) and (B) of
Sections (A) to (E) of
Sections (A) to (E) of
Section (A) of
Section (A) of
Sections (A) and (B) of
Section (A) of
Sections (A) and (B) of
Section (A) of
Section (A) of
Section (A) of
Section (A) of
Sections (A) and (B) of
Sections (A) of
Sections (A) and (B) of
Section (A) of
Section (A) of
Section (A) of
Sections (A) to (C) of
Sections (A) to (C) of
Sections (D) to (F) of
In the following embodiments, an example of the structure of a coil unit including a non-contact wireless communication coil and a non-contact power transmission coil and a portable wireless terminal including the coil unit is given as an example of a non-contact wireless communication coil and a portable wireless terminal including the non-contact wireless communication coil.
(First Embodiment)
The coil unit according to this embodiment includes a first magnetic body 11, a first coil 12 which functions as a non-contact power transmission coil, a second magnetic body 21, and a second coil 22 which functions as a non-contact wireless communication coil. The first magnetic body 11 is provided corresponding to the first coil 12 and the second magnetic body 21 is provided corresponding to the second coil 22.
The first magnetic body 11 has a rectangular plate shape and the first coil 12 is arranged on one surface of the plate. The first magnetic body 11 is made of a material with permeability greater than 1, such as ferrite. The first magnetic body 11 has a relative permeability μr1 of, for example, 200 to 2000. The first coil 12 is a coil obtained by winding a conductive winding wire in an elliptical ring shape, serves as a charging coil, and received power supplied from an external charger. A resonance frequency f1 of the first coil 12 is obtained by adjusting the resonance frequency of the first coil 12 using, for example, a capacitor which is connected in parallel or series to the first coil 12 and is, for example, about 100 kHz.
The second magnetic body 21 has a plate with a rectangular ring shape and a substrate 30 having the second coil 22 mounted thereon is arranged on one surface of the plate. The second magnetic body 21 is made of a material with permeability greater than 1, such as ferrite. The second magnetic body 21 has a relative permeability μr2 of, for example, 10 to 300. The second coil 22 is a coil that is wound in a rectangular ring shape by a conductive wiring pattern formed on the substrate 30 which is, for example, a glass epoxy substrate. The second coil 22 serves as a non-contact wireless communication coil and transmits and receives data to and from an external device, such as a reader/writer device. A resonance frequency f2 of the second coil 22 is obtained by adjusting the resonance frequency of the second coil 22 using, for example, a capacitor which is connected in parallel or series to the second coil 22 and is, for example, about 13.56 MHz.
First terminals 31 for the first coil 12 and second terminals 32 for the second coil 22 are formed at one end of the substrate 30 by a conductive wiring pattern. The first terminals 31 are connected to the first coil 12 through wiring lines and the second terminals 32 are connected to the second coil 22 through the wiring pattern of the substrate 30.
The coil unit according to this embodiment is arranged in the thickness direction (the up-down direction of
In this case, the first coil 12 and the second coil 22 may entirely overlap each other. It is preferable that the first coil 12 and the second coil 22 do not at least partially overlap each other. That is, it is preferable that the first coil 12 and the second coil 22 be arranged such that they do not entirely overlap each other, but at least partially overlap each other. In the example shown in the drawings, a portion of the outer circumference of the first coil 12 overlaps a portion of the inner circumference of the second coil 22 such that a region in which the two coils do not overlap each other is formed. Since the first coil 12 has an elliptical shape and the second coil 22 has a rectangular shape, four corner portions of the second coil 22 are non-overlap regions and the second coil 22 is disposed outside the first coil 12 in the four corner portions. This structure can reduce the electromagnetic coupling between the two coils.
In this embodiment, the resonance frequency relationship between the first coil 12 and the second coil 22 is established such that the resonance frequency of the first coil 12 is lower than the resonance frequency of the second coil 22 (f1<f2). It is preferable that the permeability relationship between the first magnetic body 11 and the second magnetic body 21 is established such that the permeability of the first magnetic body 11 is greater than the permeability of the second magnetic body 21 (the relative permeability μr1>the relative permeability μr2). When the characteristics of the coil and the magnetic body are set as described above, it is possible to effectively reduce performance deterioration due to the electromagnetic coupling between the two coils.
Next, an action when the coil unit according to this embodiment operates will be described.
When the first coil 12 operates, that is, when power is transmitted, the magnetic field is generated in the vicinity of the first coil 12 such that magnetic field lines pass through the first magnetic body 11 and are then emitted to a space, as shown in Section (A) of
In this embodiment, since the laminated first and second coils 12 and 22 have a non-overlap region therebetween, the electromagnetic coupling between the coils is reduced. In particular, it is possible to sufficiently reduce the electromagnetic coupling in four corner regions of the coils in which the two coils do not overlap each other, as shown in Sections (A) and (B) of
A portable wireless terminal 50 includes the first coil 12 for charging and the second coil 22 for non-contact wireless communication. The first coil 12 is connected to a non-contact charging unit 51 and the second coil 22 is connected to a non-contact wireless communication unit 52. Here, the first coil 12 is connected in parallel to a capacitor 54 and is also connected to a rectifying circuit 55 of the non-contact charging unit 51. The second coil 22 is connected in parallel to a capacitor 56 and is also connected to a modulation/demodulation circuit 57 of the non-contact wireless communication unit 52. The non-contact charging unit 51 and the non-contact wireless communication unit 52 are connected to a control circuit 53. The control circuit 53 controls the operation of each unit.
A charger 60 includes a non-contact power transmission coil 63. The non-contact power transmission coil 63 is connected in parallel to a capacitor 64 and is also connected to an AC power circuit 61. The AC power circuit 61 is connected to a control circuit 62 and the output of charging AC power is controlled by the control circuit 62.
A reader/writer device 70 includes a non-contact wireless communication coil 73. The non-contact wireless communication coil 73 is connected in parallel to a capacitor 74 and is also connected to a modulation/demodulation circuit 71. The modulation/demodulation circuit 71 is connected to a control circuit 72 and the control circuit 72 controls an operation of modulating and demodulating data transmitted by non-contact wireless communication.
In the above-mentioned structure, when the portable wireless terminal 50 is charged, the non-contact power transmission coil 63 of the charger 60 is arranged close to the first coil 12 of the portable wireless terminal 50 so as to face the first coil 12 and power is supplied from the charger 60 to the portable wireless terminal 50. In this case, the non-contact power transmission coil 63 and the first coil 12 are electromagnetically coupled and charging power is transmitted through the two coils in a non-contact manner. The resonance frequency f1 for supplying power from the non-contact power transmission coil 63 to the first coil 12 is adjusted by the capacitor 54 which is connected in parallel to the first coil 12 and the capacitor 64 which is connected in parallel to the non-contact power transmission coil 63 and is 100 kHz in this embodiment. AC power which is generated and output from the AC power circuit 61 is transmitted from the non-contact power transmission coil 63 to the first coil 12 and is received by the portable wireless terminal 50. The transmitted AC power is rectified into DC power by the rectifying circuit 55 and the DC output is supplied to a battery unit 58. In this way, the portable wireless terminal 50 is charged. In addition, the DC output may be supplied as power for operating each unit to a circuit in the portable wireless terminal 50.
When non-contact wireless communication is performed, the non-contact wireless communication coil 73 of the reader/writer device 70 is arranged close to the second coil 22 of the portable wireless terminal 50 so as to face the second coil 22 and data is transmitted and received between the reader/writer device 70 and the portable wireless terminal 50. In this case, the non-contact wireless communication coil 73 and the second coil 22 are electromagnetically coupled to each other and data is transmitted through the two coils by non-contact wireless communication. The resonance frequency f2 for communication between the non-contact wireless communication coil 73 and the second coil 22 is adjusted by the capacitor 56 which is connected in parallel to the second coil 22 and the capacitor 74 which is connected in parallel to the non-contact wireless communication coil 73 and is 13.56 MHz in this embodiment. Data transmitted from the reader/writer device 70 to the portable wireless terminal 50 is modulated by the modulation/demodulation circuit 71. The modulated data is transmitted from the non-contact wireless communication coil 73 to the second coil 22 and is then received by the portable wireless terminal 50. The transmitted data is demodulated by the modulation/demodulation circuit 57 of the portable wireless terminal 50. Data transmitted from the portable wireless terminal 50 to the reader/writer device 70 is modulated by the modulation/demodulation circuit 57. The modulated data is transmitted from the second coil 22 to the non-contact wireless communication coil 73 and is then received by the reader/writer device 70. The transmitted data is demodulated by the modulation/demodulation circuit 71 of the reader/writer device 70. As such, the use of the non-contact wireless communication function of the portable wireless terminal 50 makes it possible for the reader/writer device 70 to write and read data to and from the portable wireless terminal 50 using non-contact wireless communication.
Next, an example in which the performance of the coil unit according to this embodiment is measured using evaluation samples that are actually manufactured will be described.
In the example, the first magnetic body 11 had a long side a of 48 mm and a short side b of 32 mm. The outside diameter c of the first coil 12 in the longitudinal direction was 41 mm and the outside diameter d thereof in the lateral direction was 30 mm. The second magnetic body 21 and the second coil 22 each had a long side e of 41 mm and a short side f of 31 mm. The coil unit obtained by laminating the first and second magnetic bodies had a thickness g of 1.5 mm. In this case, with the first coil 12 and the second coil 22 being laminated, the two coils overlap each other such that the outer circumference dimensions thereof are substantially equal to each other and a region in which the two coils do not overlap each other is formed on the inner circumferential side. Since the first coil 12 has an elliptical shape and the second coil 22 has a rectangular shape, four corner portions of the second coil 22 are the non-overlap regions.
In the state shown in Section (A) of
In the state shown in Section (B) of
It is confirmed that, when the second magnetic body 21 is removed from the state shown in Section (C) of
As such, according to this embodiment, when a plurality of coils, that is, the first coil 12 and the second coil 22 coexist, it is possible to reduce the electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since a plurality of coils are arranged so as to be laminated, it is possible to reduce an arrangement area and to achieve a small coil with small performance deterioration. Therefore, in the portable wireless terminal provided with the coil unit including the non-contact wireless communication coil according to this embodiment, it is possible to prevent performance deterioration both during non-contact power transmission and during non-contact wireless communication while reducing the size of the portable wireless terminal and to obtain a desired performance with a small coil unit.
(Second Embodiment)
The second embodiment is an example in which the shape of the first coil according to the first embodiment is changed. Similarly to the first embodiment, a first magnetic body 11A has a rectangular plate shape. A first coil 12A is a coil obtained by winding a conductive winding wire in a rectangular ring shape with rounded corners. A second magnetic body 21A and a second coil 22A have substantially the same structure as those in the first embodiment. That is, the second magnetic body 21A is a plate with a rectangular ring shape and the second coil 22A is a coil which is wound in a rectangular ring shape by a conductive wiring pattern formed on a substrate 30A such as a glass epoxy substrate.
Similarly to the first embodiment, in the thickness direction of the coil (in the up-down direction in Sections (B) and (C) of
The first coil 12A and the second coil 22A are arranged so as to at least partially overlap each other and to have a non-overlap region therebetween. In this case, the outside of the first coil 12A overlaps the outside of the second coil 22A such that a region in which the coils do not overlap each other is formed on the inner circumferential side of the coils. Since the first coil 12A has a rectangular shape with rounded corners and the second coil 22A has a rectangular shape, four corner portions of the second coil 22A are the non-overlap regions.
According to this structure, similarly to the first embodiment, even when two coils are laminated and coexist, it is possible to reduce the electromagnetic coupling between the two coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since two coils are arranged so as to be laminated, it is possible to reduce the size of the coil unit.
(Third Embodiment)
The third embodiment is an example in which the shape of the second coil according to the first embodiment is changed. A first magnetic body 11B and a first coil 12B have substantially the same structure as those in the first embodiment. That is, the first magnetic body 11B has a rectangular plate shape and the first coil 12B is a coil obtained by winding a conductive winding wire in an elliptical ring shape. The second magnetic body 21B is a plate with an elliptical ring shape and the second coil 22B is a coil which is wound in an elliptical ring shape by a conductive wiring pattern formed on a substrate 30B such as a glass epoxy substrate.
Similarly to the first embodiment, in the thickness direction (in the up-down direction of Sections (B) and (C) of
The first coil 12B and the second coil 22B are arranged so as to at least partially overlap each other and to have a non-overlap region therebetween. In this case, the outside of the first coil 12B overlaps the outside of the second coil 22B such that a region in which the coils do not overlap each other is formed on the inner circumferential side of the coils. That is, the first coil 12B and the second coil 22B at least partially overlap each other on the outer circumferential side of the first coil 12B.
According to this structure, similarly to the first embodiment, even when two coils are laminated and coexist, it is possible to reduce the electromagnetic coupling between the two coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since two coils are arranged so as to be laminated, it is possible to reduce the size of the coil unit.
(Modifications)
Next, some modifications of the arrangement of the first coil and the second coil will be described.
In this case, the first coil and the second coil substantially entirely overlap each other. However, since the second magnetic body corresponding to the second coil is provided between the second coil and the first coil as shown in
In the example shown in Section (C) of
In this case, similarly to the first embodiment, a portion of the outer circumference of the first coil overlaps the second coil. Since the second magnetic body corresponding to the second coil is provided between the first coil and the second coil as shown in
As the number of non-overlap sides between the first coil and the second coil increases, the overall arrangement area of the coil increases and deterioration of characteristics due to the electromagnetic coupling between the coils can be reduced.
In the example shown in Section (C) of
In this case, similarly to the first and second embodiments, a portion of the outer circumference of the first coil overlaps the second coil. Since the second magnetic body corresponding to the second coil is provided between the first coil and the second coil as shown in
As the number of non-overlap sides between the first coil and the second coil increases, the overall arrangement area of the coil increases and deterioration of characteristics due to the electromagnetic coupling between the coils can be reduced.
(Comparative Example)
The coil unit according to the comparative example includes a first magnetic body 511, a first coil 512 which functions as a non-contact power transmission coil, and a second coil 522 which functions as a non-contact wireless communication coil.
The first magnetic body 511 has a rectangular plate shape and the first coil 512 and the second coil 522 are arranged on one surface of the plate. The first coil 512 is a coil obtained by winding a conductive winding wire in an elliptical ring shape, serves as a charging coil, and receives power supplied from an external charger. The second coil 522 is a coil which is wound in an elliptical ring shape by a conductive wiring pattern formed on a substrate 530 such as a glass epoxy substrate. The second coil 522 is a coil for non-contact wireless communication and transmits and receives data to and from an external device such as a reader/writer device. The second coil 522 is arranged on the outer circumferential side of the first coil 512. The first coil 512 and the second coil 522 are disposed substantially in the same plane so as not to overlap each other.
First terminals 531 for the first coil 512 and second terminals 532 for the second coil 522 are formed at one end of the substrate 530 by a conductive wiring pattern. The first terminals 531 are connected to the first coil 512 through wiring lines and the second terminals 532 are connected to the second coil 522 by the wiring pattern of the substrate 530.
In the comparative example, the first coil 512 and the second coil 522 are arranged so as not to overlap each other and a second magnetic body is not provided. Therefore, when the first coil 512 and the second coil 522 are close to each other, the electromagnetic coupling between the two coils increases and performance deterioration occurs due to the influence of the electromagnetic coupling. For example, it is confirmed that the maximum communication distance of non-contact wireless communication is reduced to 117 [mm]. It is difficult to increase the maximum communication distance of the non-contact wireless communication using the coil unit according to the embodiment of the invention. In addition, the second coil 522 is arranged outside the first coil 512 and two coils are provided in parallel so as not to overlap each other. Therefore, the arrangement area of the coils increases and the size of the wireless communication terminal including the coil unit increases.
In contrast, in the embodiment of the invention, when a plurality of coils coexist, the above-mentioned structure can reduce the size of the wireless communication terminal and prevent the performance deterioration of each coil.
(Prehistory of Fourth to Sixth Embodiments)
In the structure disclosed in PTL 1, since two coils are arranged so as to form a double ring, the arrangement area of the coils is large. In addition, a plurality of coils are simply provided in parallel, without considering the performance of each coil, and it is expected that performance deterioration will occur due to the electromagnetic coupling between the coils. In particular, when a plurality of coils are arranged close to each other in order to reduce the size of the terminal including the coils, performances, such as power transmission efficiency and the communication distance, deteriorate due to the electromagnetic coupling between the coils.
In addition, when the arrangement of two coils in the wireless card disclosed in PTL 1 is applied to a portable wireless terminal having the non-contact charge function and the non-contact wireless communication function, it is considered that the simple arrangement of each coil capable of preventing performance deterioration due to the parallel arrangement of two coils and reducing the size of the portable wireless terminal is required.
In the fourth to sixth embodiments, a transmission coil and a portable wireless terminal will be described which are conceived to solve the above-mentioned problems of the related art and can simply reduce the thickness of a housing while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist in the housing.
In the following fourth to sixth embodiments, an example of the structure of a coil unit serving as the transmission coil including the non-contact wireless communication coil and the non-contact power transmission coil and a portable wireless terminal including the coil unit is given as an example of the transmission coil according to the invention and the portable wireless terminal including the transmission coil.
(Fourth Embodiment)
In the following description, the direction of the arrow H and the direction opposite to the direction of the arrow H are referred to as a “thickness direction of the coil” and a direction perpendicular to the thickness direction of the coil is referred to as a “plane direction of the coil”.
The coil unit according to this embodiment includes a first magnetic body 11 with a predetermined permeability, a first coil 12 which functions as a non-contact power transmission coil, a second magnetic body 21 with a permeability different from the predetermined permeability of the first magnetic body 11, and a second coil 22 which functions as a non-contact wireless communication coil. In the coil unit according to this embodiment, the first magnetic body 11 is provided corresponding to the first coil 12 and the second magnetic body 21 is provided corresponding to the second coil 22.
The first magnetic body 11 has a rectangular plate shape. The first coil 12 is arranged on one surface (a surface facing the inner wall of the rear housing of the portable wireless terminal) of the plate. For example, a battery pack or a shield case (not shown) is arranged on the other surface (a surface facing the inside of the housing of the portable wireless terminal) of the plate. The first magnetic body 11 is made of, for example, a material with permeability greater than 1, such as ferrite. The first magnetic body 11 has a relative permeability μr1 of, for example, 200 to 2000.
The first coil 12 is a coil obtained by winding a conductive winding wire in an elliptical ring shape, serves as a charging coil, and receives power supplied (transmitted) from an external charger. A resonance frequency f1 of the first coil 12 is a frequency which is adjusted by, for example, a capacitor that is connected in parallel or series to the first coil 12 and is, for example, about 100 kHz. The first magnetic body 11 and the first coil 12 have substantially the same outside diameter.
The second magnetic body 21 is a plate with a rectangular ring shape. The second coil 22 which is provided on one side of the substrate 30 in the direction (the direction toward the inside of the housing of the portable wireless terminal) opposite to the direction of the arrow H shown in Section (A) of
The entire surface of the second magnetic body 21 is arranged outside the outer circumference of the first magnetic body 11 in the plane direction of the coil. The second magnetic body 21 is made of a material with permeability greater than 1, such as ferrite. The second magnetic body 21 has a relative permeability μr2 of, for example, 10 to 300. A second boundary surface B2 between the second magnetic body 21 and the second coil 22 is higher than a first boundary surface B1 between the first magnetic body 11 and the first coil 12 in the thickness direction of the coil, particularly, in the direction of the arrow H (see Section (C) of
The second coil 22 is a coil which is wound in a rectangular ring shape by a conductive wiring pattern formed on the surface of the substrate 30 that faces in the direction opposite to the direction of the arrow H shown in Section (A) of
The substrate 30 is formed using, for example, a glass epoxy resin or a flexible printed substrate. The rear housing of the portable wireless terminal which is formed of, for example, an acrylonitrile butadiene styrene (ABS) resin is arranged on a surface of the substrate 30 which faces in the direction of the arrow H in Section (A) of
In the coil unit according to this embodiment, the first magnetic body 11 and the second magnetic body 21 are arranged in the thickness direction (in the up-down direction of
In this case, it is preferable that the first coil 12 and the second coil 22 be arranged so as not to overlap each other in the thickness direction of the coil. Since the first coil 12 has an elliptical shape and the second coil 22 has a rectangular shape, the first coil 12 and the second coil 22 do not overlap each other in four corner portions of the second coil 22. The second coil 22 is positioned outside the first coil 12 in the four corner portions. According to this structure, it is possible to reduce the electromagnetic coupling between two coils. In
In this embodiment, the resonance frequency relationship between the first coil 12 and the second coil 22 is established such that the resonance frequency of the first coil 12 is lower than that of the second coil 22 (f1 <f2). It is preferable that the permeability relationship between the first magnetic body 11 and the second magnetic body 21 be established such that the permeability of the first magnetic body 11 is greater than that of the second magnetic body 21 (relative permeability μr1>relative permeability μr2). When the characteristics of the first coil 12, the second coil 22, the first magnetic body 11, and the second magnetic body 21 are set as described above, it is possible to effectively reduce performance deterioration due to the electromagnetic coupling between two coils.
Next, an action when the unit coil according to this embodiment operates will be described. Section (A) of
When the first coil 12 operates, that is, when power is transmitted, the magnetic field is generated in the vicinity of the first coil 12 such that magnetic field lines pass through the first magnetic body 11 and are then emitted to a space, as shown in Section (A) of
When the second coil 22 operates, that is, when data is transmitted by non-contact wireless communication, the magnetic field is generated in the vicinity of the second coil 22 such that magnetic field lines pass through the second magnetic body 21 and are then emitted to a space, as shown in Section (B) of
In this embodiment, since the coil unit has the region in which the first coil 12 and the second coil 22 do not overlap each other, the electromagnetic coupling between the coils is reduced. In particular, it is possible to sufficiently reduce the electromagnetic coupling in four corner regions of the coils in which the two coils do not overlap each other, as shown in Sections (A) and (B) of
A portable wireless terminal 50 includes the first coil 12 for charging and a second coil 22 for non-contact wireless communication. The first coil 12 is connected to a non-contact charging unit 51 and the second coil 22 is connected to a non-contact wireless communication unit 52. The first coil 12 is connected in parallel to a capacitor 54 and is also connected to a rectifying circuit 55 of the non-contact charging unit 51. The second coil 22 is connected in parallel to a capacitor 56 and is also connected to a modulation/demodulation circuit 57 of the non-contact wireless communication unit 52. The non-contact charging unit 51 and the non-contact wireless communication unit 52 are connected to a control circuit 53. The control circuit 53 controls the operation of each unit.
A charger 60 includes a non-contact power transmission coil 63. The non-contact power transmission coil 63 is connected in parallel to a capacitor 64 and is also connected to an AC power circuit 61. The AC power circuit 61 is connected to a control circuit 62 and the output of charging AC power is controlled by the control circuit 62.
A reader/writer device 70 includes a non-contact wireless communication coil 73. The non-contact wireless communication coil 73 is connected in parallel to a capacitor 74 and is also connected to a modulation/demodulation circuit 71. The modulation/demodulation circuit 71 is connected to a control circuit 72 and the control circuit 72 controls an operation of modulating and demodulating data transmitted by non-contact wireless communication.
In the above-mentioned structure, when the portable wireless terminal 50 is charged, the non-contact power transmission coil 63 of the charger 60 is arranged close to the first coil 12 of the portable wireless terminal 50 so as to face the first coil 12 and power is supplied from the charger 60 to the portable wireless terminal 50. In this case, the non-contact power transmission coil 63 and the first coil 12 are electromagnetically coupled and charging power is transmitted through the two coils in a non-contact manner. The resonance frequency f1 for supplying power from the non-contact power transmission coil 63 to the first coil 12 is adjusted by the capacitor 54 which is connected in parallel to the first coil 12 and the capacitor 64 which is connected in parallel to the non-contact power transmission coil 63 and is 100 kHz in this embodiment. AC power which is generated and output from the AC power circuit 61 is transmitted from the non-contact power transmission coil 63 to the first coil 12 and is received by the portable wireless terminal 50. The transmitted AC power is rectified into DC power by the rectifying circuit 55 and the DC output is supplied to a battery unit 58. In this way, the portable wireless terminal 50 is charged. In addition, the DC output may be supplied as power for operating each unit to a circuit in the portable wireless terminal 50.
When non-contact wireless communication is performed, the non-contact wireless communication coil 73 of the reader/writer device 70 is arranged close to the second coil 22 of the portable wireless terminal 50 so as to face the second coil 22 and data is transmitted and received between the reader/writer device 70 and the portable wireless terminal 50. In this case, the non-contact wireless communication coil 73 and the second coil 22 are electromagnetically coupled to each other and data is transmitted through the two coils by non-contact wireless communication. The resonance frequency f2 for communication between the non-contact wireless communication coil 73 and the second coil 22 is adjusted by the capacitor 56 which is connected in parallel to the second coil 22 and the capacitor 74 which is connected in parallel to the non-contact wireless communication coil 73 and is 13.56 MHz in this embodiment. Data transmitted from the reader/writer device 70 to the portable wireless terminal 50 is modulated by the modulation/demodulation circuit 71. The modulated data is transmitted from the non-contact wireless communication coil 73 to the second coil 22 and is then received by the portable wireless terminal 50. The transmitted data is demodulated by the modulation/demodulation circuit 57 of the portable wireless terminal 50. Data transmitted from the portable wireless terminal 50 to the reader/writer device 70 is modulated by the modulation/demodulation circuit 57. The modulated data is transmitted from the second coil 22 to the non-contact wireless communication coil 73 and is then received by the reader/writer device 70. The transmitted data is demodulated by the modulation/demodulation circuit 71 of the reader/writer device 70. As such, the use of the non-contact wireless communication function of the portable wireless terminal 50 makes it possible for the reader/writer device 70 to write and read data to and from the portable wireless terminal 50 using non-contact wireless communication.
(Example of Coil Unit)
Next, an example in which the performance of the coil unit according to this embodiment is measured using actually manufactured evaluation samples will be described. Sections of (A) and (B) of
In the example, the first magnetic body 11 had a square shape with a side a of 30 mm, the first coil 12 had a circular shape with an outside diameter b of 29 mm, the second magnetic body 21 had a shape in which a square having a side d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm, and the coil unit had a thickness e of 0.8 mm. In this case, the first magnetic body 11 and the first coil 12 overlap each other such that the dimensions of the outer circumferences thereof are substantially equal to each other, the second magnetic body 21 and the second coil 22 overlap each other such that the dimensions of the outer circumferences thereof are substantially equal to each other, and the first coil 12 and the second coil 22 do not overlap each other. In particular, since the first coil 12 has a circular shape and the second coil 22 has a rectangular shape, the distance between the first coil 12 and the second coil 22 in four corner portions of the second coil 22 is large.
Section (A) of
In a state in which the second coil 22 was removed from Section (D) of
In a state in which the first coil 12 was removed from Section (D) of
(Comparative Example of Coil Unit)
Next, the performance of a coil unit according to a comparative example which is compared with the performance of the coil unit according to this embodiment is measured using evaluation samples. Sections (A) and (B) of
In the comparative example, the first magnetic body 11 had a square shape with a side a of 30 mm, the first coil 12 had a circular shape with an outside diameter b of 29 mm, the second coil 22 was formed in the range of a shape in which a square with a side d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm, and the coil unit had a thickness e of 0.8 mm. In addition, in the coil unit according to the comparative example, as shown in Section (E) of
Section (A) of
In a state in which the second coil 22 was removed from Section (D) of
In a state in which the first coil 12 was removed from Section (D) of
Therefore, in the coil unit according to the example, the second magnetic body 21 corresponding to the second coil 22 is provided outside the first magnetic body 11 corresponding to the first coil 12, and the first boundary surface B1 between the first coil 12 and the first magnetic body 11 is substantially flush with the second boundary surface B2 between the second coil 22 and the second magnetic body 21 or the second boundary surface B2 is higher than the first boundary surface B1 in the thickness direction of the coil. Therefore, it is possible to increase the maximum communication distance during non-contact wireless communication.
As such, according to this embodiment, when a plurality of coils, such as the first coil 12 and the second coil 22, coexist in the housing, it is possible to reduce the electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, as such, when a plurality of magnetic bodies are parallel to the coils and the coils are arranged close to each other, it is possible to provide a coil with low performance deterioration and to simply reduce the thickness of the housing. Therefore, in the portable wireless terminal provided with the coil unit including the non-contact wireless communication coil according to this embodiment, it is possible to prevent performance deterioration both during non-contact power transmission and during non-contact wireless communication while reducing the size of the portable wireless terminal. The use of the coil unit capable of simply reducing the thickness of the housing of the portable wireless terminal makes it possible to obtain a desired performance (a power transmission performance and a communication performance).
(Fifth Embodiment)
The fifth embodiment is an example in which the shape of the second magnetic body 21 and the second coil 22 according to the fourth embodiment is changed. A first magnetic body 11A and a first coil 12A have substantially the same structure as those in the fourth embodiment. That is, the first magnetic body 11A has a rectangular plate shape and the first coil 12A is a coil obtained by winding a conductive winding wire in an elliptical ring shape. The second magnetic body 21A is a plate with an elliptical ring shape and the second coil 22A is a coil which is wound in an elliptical ring shape by a conductive wiring pattern formed on a surface of a substrate 30A that faces a direction opposite to the direction of an arrow H shown in
In the coil unit according to this embodiment, similarly to the first embodiment, the first magnetic body 11A and the second magnetic body 21A are arranged in the thickness direction (in the up-down direction of Sections (A) and (B) of
The first coil 12A and the second coil 22A are arranged so as not to overlap each other in the thickness direction of the coil.
According to this structure, similarly to the fourth embodiment, even when two coils coexist so as to be close to each other, it is possible to reduce the electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since two coils coexist and are arranged in parallel to each other, it is possible to simply reduce the thickness of the housing of the portable wireless terminal including the coil unit. Therefore, it is possible to reduce the size of the portable wireless terminal.
(Prehistory of Sixth Embodiment)
Section (B) of
Section (C) of
As shown in Section (D) of
As shown in Section (D) of
This result proved that, when the position of the second magnetic body 21 varied in the direction in which communication performance was reduced in the thickness direction of the coil, the maximum communication distance was changed in the range of 117 [mm] to 128 [mm] and it was difficult to stabilize the communication performance obtained by the second coil 22.
(Sixth Embodiment)
In the sixth embodiment, for example, it is considered that the positional of a second magnetic body is likely to vary in a direction in which communication performance is reduced in the thickness of a coil when a portable wireless terminal is manufactured, and an example of a coil unit will be described which prevents the positional deviation of the second magnetic body such that the variation does not occur in the direction in which the communication performance of the second coil is reduced.
Sections (B) and (C) of
Specifically, in Section (B) of
The spacer 25 is a plate with a rectangular ring shape, similarly to the second magnetic body 21B. The shape of the spacer 25 is not limited to the plate with a rectangular ring shape as long as the spacer 25 can regulate the position of the second magnetic body 21B. For example, the spacer 25 may have a block shape which is arranged only at four corners of the bottom (lower surface) of the second magnetic body 21B. The spacer 25 may be made of, for example, a metal material, a resin, or a substrate (a glass epoxy substrate or a flexible substrate). The material forming the spacer 25 is not particularly limited.
In Section (C) of
(Example of Coil Unit)
Next, two examples (Examples 1 and 2) will be described in which the performance of the coil unit according to the sixth embodiment is measured using evaluation samples which are actually manufactured.
Section (A) of
As shown in Section (E) of
In Example 1, the first magnetic body 11 had a square shape with a side a of 30 mm, the first coil 12 had a circular shape with an outside diameter b of 29 mm, and the second magnetic body 21 had a shape in which a square having a side d of 31 mm was cut out from a substantially central portion of a square with a side c of 40 mm. In addition, the coil unit had a thickness e of 0.8 mm.
In this case, the first magnetic body 11 and the first coil 12 overlap each other such that the dimensions of the outer circumferences thereof are substantially equal to each other, the second magnetic body 21B and the second coil 22 overlap each other such that the dimensions of the outer circumferences thereof are substantially equal to each other, and the first coil 12 and the second coil 22 are provided so as not to overlap each other. In particular, since the first coil 12 has a circular shape and the second coil 22 has a rectangular shape, the distance between the first coil 12 and the second coil 22 in four corner portions of the second coil 22 is large.
In addition, in the coil unit according to Example 1, in order to prevent the position of the second magnetic body 21B from varying in the direction in which communication performance is reduced in the thickness direction of the coil, the spacer 25 for regulating the position of the second magnetic body 21B is arranged so as to come into contact with the bottom (lower surface) of the second magnetic body 21B. Therefore, the bottom (lower surface) of the first magnetic body 11 and the bottom (lower surface) of the spacer 25 are flush with each other and come into contact with the opposite member 40 (for example, a battery pack, a shield case, or the inner wall of the housing).
The dimensions of the coil unit according to Example 2 are the same as those of the coil unit according to Example 1 except that the spacer 25 is omitted and the thickness of the second magnetic body is different. Therefore, the description of Sections (A) to (C) in
Section (D) of
As shown in Section (A) of
As shown in Section (B) of
As such, according to the sixth embodiment, since the spacer 25 is provided so as to come into contact with the bottom (lower surface) of the second magnetic body 21B or since the thickness of the second magnetic body 21C is equal to or greater than that of the first magnetic body 11, the position of the second magnetic bodies 21B and 21C in the thickness direction of the coil is regulated. Therefore, in the coil unit according to this embodiment, it is possible to prevent the position of the second magnetic body from varying in the direction in which communication performance is reduced in the thickness direction of the coil and to stabilize the communication performance (for example, the maximum communication distance) of the second coil.
In addition, the surface of the member 40 may not be a flat surface.
Sections (A) and (B) of
Sections (C) and (D) of
As such, when the member 40 does not have a flat surface, but has a shape corresponding to the bottom of the coil unit, the height of the second boundary surface B2 is equal to or greater than that of the first boundary surface B1, considering the difference in the height of the surface of the member 40. Therefore, it is possible to adjust the thickness of the spacer 25 or the thickness of the second magnetic bodies 21B and 21C.
The shape of the coil is not particularly limited. For example, the coil may have any shape, such as a rectangular shape, a circular shape, or an elliptical shape.
In the above-described sixth embodiment, when the thickness of the second magnetic body 21 is equal to or less than that of the first magnetic body 11, the spacer 25 is provided. However, when the thickness of the second magnetic body 21 is equal to or greater than that of the first magnetic body 11, the spacer may be provided below the second magnetic body 21. In this case, it is also possible to stabilize the communication performance of the second coil 22.
In the above-described embodiments, for ease of understanding, the coil unit is arranged in the up-down direction. However, the coil unit may be arranged in any direction such as the left-right direction.
(Prehistory of Seventh to Ninth Embodiments)
In the structure disclosed in PTL 1, since two coils are arranged so as to form a double ring, the arrangement area of the coils is large. In addition, a plurality of coils are simply provided in parallel, without considering the performance of each coil, and it is expected that performance deterioration will occur due to the electromagnetic coupling between the coils. In particular, when a plurality of coils are arranged so as to be close to each other in order to reduce the size of the terminal including the coils, performances, such as power transmission efficiency and the communication distance, deteriorate due to the electromagnetic coupling between the coils.
In addition, PTL 1 does not disclose a technique for simplifying a wireless card manufacturing process when two coils are used. The portable wireless terminal including the non-contact charge function and the non-contact wireless communication function is likely to be spread in the future. When the portable wireless terminal is mass-produced, the arrangement of the coils capable of preventing the performance deterioration of two coils and being simply manufactured is considered.
In the seventh to ninth embodiments, a transmission coil and a portable wireless terminal will be described which are conceived in view of the above-mentioned problems of the related art, can be simply manufactured with a small size, and can prevent the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist.
In the following seventh to ninth embodiments, an example of the structure of a coil unit serving as a transmission coil including the non-contact wireless communication coil and the non-contact power transmission coil and a portable wireless terminal including the coil unit is given as an example of the transmission coil according to the invention and the portable wireless terminal including the transmission coil.
(Seventh Embodiment)
The coil unit according to this embodiment includes a first magnetic body 11 with predetermined permeability, a first coil 12 which functions as a non-contact power transmission coil, a second magnetic body 21 with a permeability different from the predetermined permeability of the first magnetic body 11, and a second coil 22 which functions as a non-contact wireless communication coil. In the coil unit according to this embodiment, the first magnetic body 11 is provided corresponding to the first coil 12 and the second magnetic body 21 is provided corresponding to the second coil 22.
The first magnetic body 11 has a rectangular plate shape. The first coil 12 is arranged on one surface (a surface facing the inner wall of the rear housing of the portable wireless terminal) of the plate. For example, a battery pack or a shield case (not shown) is arranged on the other surface (a surface facing the inside of the housing of the portable wireless terminal) of the plate. The first magnetic body 11 is made of, for example, a material with permeability greater than 1, such as ferrite. The first magnetic body 11 has a relative permeability μr1 of, for example, 200 to 2000.
The first coil 12 is a coil obtained by winding a conductive winding wire in an elliptical ring shape, serves as a charging coil, and receives power supplied (transmitted) from an external charger. A resonance frequency f1 of the first coil 12 is a frequency which is adjusted by, for example, a capacitor that is connected in parallel or series to the first coil 12 and is, for example, about 100 kHz.
The second magnetic body 21 is a plate with a rectangular ring shape. One surface (a surface facing the inside of the housing of the portable wireless terminal) of the plate is arranged so as to come into contact with one surface (a surface facing the inner wall of the rear housing of the portable wireless terminal) of the first magnetic body 11. The second coil 22 which is provided on one side of the substrate 30 in a direction (a direction toward the inside of the housing of the portable wireless terminal) opposite to the direction of the arrow H shown in Section (A) of
The second coil 22 is a coil which is wound in a rectangular ring shape by a conductive wiring pattern formed on the surface of the substrate 30 that faces in the direction opposite to the direction of the arrow H shown in Section (A) of
The substrate 30 is formed using, for example, a glass epoxy resin or a flexible printed substrate. The rear housing of the portable wireless terminal which is formed of, for example, acrylonitrile butadiene styrene (ABS) is arranged on a surface of the substrate 30 which faces in the direction of the arrow H in Section (A) of
In the coil unit according to this embodiment, in the thickness direction (in the up-down direction of
In this case, it is preferable that the first coil 12 and the second coil 22 be arranged so as not to overlap each other in the thickness direction of the coil. Since the first coil 12 has an elliptical shape and the second coil 22 has a rectangular shape, the first coil 12 and the second coil 22 do not overlap each other in four corner portions of the second coil 22. The second coil 22 is positioned outside the first coil 12 in the four corner portions. According to this structure, it is possible to reduce the electromagnetic coupling between two coils.
In this embodiment, the resonance frequency relationship between the first coil 12 and the second coil 22 is established such that the resonance frequency of the first coil 12 is lower than that of the second coil 22 (f1 <f2). It is preferable that the permeability relationship between the first magnetic body 11 and the second magnetic body 21 be established such that the permeability of the first magnetic body 11 is greater than that of the second magnetic body 21 (relative permeability μr1>relative permeability μr2). When the characteristics of the first coil 12, the second coil 22, the first magnetic body 11, and the second magnetic body 21 are set as described above, it is possible to effectively reduce performance deterioration due to the electromagnetic coupling between two coils.
Next, an action when the unit coil according to this embodiment operates will be described. Section (A) of
When the first coil 12 operates, that is, when power is transmitted, the magnetic field is generated in the vicinity of the first coil 12 such that magnetic field lines pass through the first magnetic body 11 and are then emitted to a space, as shown in Section (A) of
When the second coil 22 operates, that is, when data is transmitted by non-contact wireless communication, the magnetic field is generated in the vicinity of the second coil 22 such that magnetic field lines pass through the second magnetic body 21 and are then emitted to a space, as shown in Section (B) of
In this embodiment, since the coil unit has the region in which the first coil 12 and the second coil 22 do not overlap each other, the electromagnetic coupling between the coils is reduced. In particular, it is possible to sufficiently reduce the electromagnetic coupling in four corner regions of the coils in which the two coils do not overlap each other, as shown in Sections (A) and (B) of
A portable wireless terminal 50 includes the first coil 12 for charging and a second coil 22 for non-contact wireless communication. The first coil 12 is connected to a non-contact charging unit 51 and the second coil 22 is connected to a non-contact wireless communication unit 52. The first coil 12 is connected in parallel to a capacitor 54 and is also connected to a rectifying circuit 55 of the non-contact charging unit 51. The second coil 22 is connected in parallel to a capacitor 56 and is also connected to a modulation/demodulation circuit 57 of the non-contact wireless communication unit 52. The non-contact charging unit 51 and the non-contact wireless communication unit 52 are connected to a control circuit 53. The control circuit 53 controls the operation of each unit.
A charger 60 includes a non-contact power transmission coil 63. The non-contact power transmission coil 63 is connected in parallel to a capacitor 64 and is also connected to an AC power circuit 61. The AC power circuit 61 is connected to a control circuit 62 and the output of charging AC power is controlled by the control circuit 62.
A reader/writer device 70 includes a non-contact wireless communication coil 73. The non-contact wireless communication coil 73 is connected in parallel to a capacitor 74 and is also connected to a modulation/demodulation circuit 71. The modulation/demodulation circuit 71 is connected to a control circuit 72 and the control circuit 72 controls an operation of modulating and demodulating data transmitted by non-contact wireless communication.
In the above-mentioned structure, when the portable wireless terminal 50 is charged, the non-contact power transmission coil 63 of the charger 60 is arranged close to the first coil 12 of the portable wireless terminal 50 so as to face the first coil 12 and power is supplied from the charger 60 to the portable wireless terminal 50. In this case, the non-contact power transmission coil 63 and the first coil 12 are electromagnetically coupled and charging power is transmitted through the two coils in a non-contact manner. The resonance frequency f1 for supplying power from the non-contact power transmission coil 63 to the first coil 12 is adjusted by the capacitor 54 which is connected in parallel to the first coil 12 and the capacitor 64 which is connected in parallel to the non-contact power transmission coil 63 and is 100 kHz in this embodiment. AC power which is generated and output from the AC power circuit 61 is transmitted from the non-contact power transmission coil 63 to the first coil 12 and is received by the portable wireless terminal 50. The transmitted AC power is rectified into DC power by the rectifying circuit 55 and the DC output is supplied to a battery unit 58. In this way, the portable wireless terminal 50 is charged. In addition, the DC output may be supplied as power for operating each unit to a circuit in the portable wireless terminal 50.
When non-contact wireless communication is performed, the non-contact wireless communication coil 73 of the reader/writer device 70 is arranged close to the second coil 22 of the portable wireless terminal 50 so as to face the second coil 22 and data is transmitted and received between the reader/writer device 70 and the portable wireless terminal 50. In this case, the non-contact wireless communication coil 73 and the second coil 22 are electromagnetically coupled to each other and data is transmitted through the two coils by non-contact wireless communication. The resonance frequency f2 for communication between the non-contact wireless communication coil 73 and the second coil 22 is adjusted by the capacitor 56 which is connected in parallel to the second coil 22 and the capacitor 74 which is connected in parallel to the non-contact wireless communication coil 73 and is 13.56 MHz in this embodiment. Data transmitted from the reader/writer device 70 to the portable wireless terminal 50 is modulated by the modulation/demodulation circuit 71. The modulated data is transmitted from the non-contact wireless communication coil 73 to the second coil 22 and is then received by the portable wireless terminal 50. The transmitted data is demodulated by the modulation/demodulation circuit 57 of the portable wireless terminal 50. Data transmitted from the portable wireless terminal 50 to the reader/writer device 70 is modulated by the modulation/demodulation circuit 57. The modulated data is transmitted from the second coil 22 to the non-contact wireless communication coil 73 and is then received by the reader/writer device 70. The transmitted data is demodulated by the modulation/demodulation circuit 71 of the reader/writer device 70. As such, the use of the non-contact wireless communication function of the portable wireless terminal 50 makes it possible for the reader/writer device 70 to write and read data to and from the portable wireless terminal 50 using non-contact wireless communication.
(Example of Coil Unit)
Next, an example in which the performance of the coil unit according to this embodiment is measured using evaluation samples that are actually manufactured will be described. Sections (A) and (B) of
In the example, the first magnetic body 11 had a square shape with a side a of 40 mm, the first coil 12 had a circular shape with an outside diameter b of 29 mm, the second magnetic body 21 had a shape in which a square having a side d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm, and the coil unit had a thickness e of 1.0 mm. In this case, the first magnetic body 11 and the second magnetic body 21 overlap each other such that the dimensions of the outer circumferences thereof are substantially equal to each other, and the first coil 12 and the second coil 22 do not overlap each other. In particular, since the first coil 12 has a circular shape and the second coil 22 has a rectangular shape, the distance between the first coil 12 and the second coil 22 in four corner portions of the second coil 22 is large.
Section (A) of
In a state in which the second coil 22 was removed from Section (D) of
In a state in which the first coil 12 was removed from Section (D) of
(Comparative Example of Coil Unit)
Next, the performance of a coil unit according to a comparative example which is compared with the performance of the coil unit according to this embodiment is measured using evaluation samples. Sections (A) and (B) of
In the comparative example, the first magnetic body 11 had a square shape with a side a of 40 mm, the first coil 12 had a circular shape with an outside diameter b of 29 mm, the second coil 22 was formed in the range of a shape in which a square with a side d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm, the second coil 22 was closely adhered to the first magnetic body 11, and the coil unit had a thickness e of 0.8 mm. In this case, the first coil 12 and the second coil 22 were provided so as not to overlap each other. In particular, since the first coil 12 has a circular shape and the second coil 22 has a rectangular shape, the distance between the first coil 12 and the second coil 22 in four corner portions of the second coil 22 is large.
Section (A) of
In a state in which the second coil 22 was removed from Section (D) of
In a state in which the first coil 12 was removed from Section (D) of
Therefore, in the coil unit according to the example, since the second magnetic body 21 corresponding to the second coil is provided outside the first coil 12 on the surface of the first magnetic body 11, it is possible to prevent the occurrence of electromagnetic coupling in non-contact wireless communicate and to increase the maximum communication distance.
As such, according to this embodiment, when a plurality of coils, such as the first coil 12 and the second coil 22, coexist, it is possible to reduce the electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, as such, when a plurality of magnetic bodies are laminated on the coils and the coils are arranged close to each other, it is possible to reduce the arrangement area and to simply manufacture a small coil with low performance deterioration. Therefore, in the portable wireless terminal provided with the coil unit including the non-contact wireless communication coil according to this embodiment, it is possible to prevent performance deterioration both during non-contact power transmission and during non-contact wireless communication while reducing the size of the portable wireless terminal. The use of the coil unit which has a small size and can be simply manufactured makes it possible to obtain a desired performance (a power transmission performance and a communication performance).
(Eighth Embodiment)
The eighth embodiment is an example in which the shape of the second magnetic body 21 and the second coil 22 according to the seventh embodiment is changed. A first magnetic body 11A and a first coil 12A have substantially the same structure as those in the seventh embodiment. That is, the first magnetic body 11A has a rectangular plate shape and the first coil 12A is a coil obtained by winding a conductive winding wire in an elliptical ring shape. The second magnetic body 21A is a plate with an elliptical ring shape and the second coil 22A is a coil which is wound in an elliptical ring shape by a conductive wiring pattern formed on a surface of a substrate 30A that faces in a direction opposite to the direction of an arrow H shown in
In the coil unit according to this embodiment, similarly to the seventh embodiment, in the thickness direction (in the up-down direction of Sections (A) of (B) of
The first coil 12A and the second coil 22A are arranged so as not to overlap each other in the thickness direction of the coil.
According to this structure, similarly to the seventh embodiment, even when two coils coexist so as to be close to each other, it is possible to reduce the electromagnetic coupling between the coils and to prevent performance deterioration due to the electromagnetic coupling. In addition, since two coils are arranged so as to coexist, it is possible to reduce the size of the portable wireless terminal.
(Prehistory of Ninth Embodiment)
When the positional deviation between a first coil and a second coil occurs, that is, when the positional deviation occurs such that the distance (gap) between the first coil and the second coil is reduced, the performance of a coil unit deteriorates, which will be described below with reference to
Section (A) of
Specifically, in the upper right portion of Section (B) of
In the upper right portion of Section (C) of
Section (A) of
In Sections (A) and (B) of
(Ninth Embodiment)
In the ninth embodiment, when the coil unit is assembled, the positional deviation between the second coil and the first coil does not occur. That is, in the ninth embodiment, an example of a coil unit will be described in which, when the coil unit is assembled, the gap between the first coil and the second coil is equal to or greater than a predetermined value and performance deterioration due to the position deviation between the coils is prevented.
First, the assembly of the coil unit will be described briefly. Sections (A) to (C) of
Before an example or another example of the first process, a partial coil unit obtained by attaching a second coil 22 that is formed as a copper foil pattern (metal pattern) on a substrate 30 to the surface of a second magnetic body 21 is prepared.
In the example of the first process shown in Section (A) of
In another example of the first process shown in Section (B) of
The assembly of the coil unit is completed as shown in Section (C) of
When the coil unit is assembled by any one of the processes shown in Sections (A) and (B) of
In the ninth embodiment, a guide member which guides the first coil 12 or the partial coil unit is formed on the second magnetic body 21 or the substrate 30 and the distance (gap) between the first coil and the second coil is equal to or greater than a predetermined value when the coil unit is assembled.
Next, two examples (Examples 1 and 2) in which measurement is performed using evaluation samples that are manufactured by simulations will be described.
In Example 1, a first magnetic body 11B had a square shape with a side a of 40 mm, a first coil 12B had a circular shape with an outside diameter b of 29 mm, and the second magnetic body 21B had a shape in which a circle having an outside diameter d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm. In addition, the coil unit had a thickness e of 1.0 mm.
In this case, the dimensions of the inner circumference of the first coil 12B are substantially equal to those of the inner circumference of the second coil 22B. The first coil 12B and the second coil 22B overlap each other on the surface of the first magnetic body 11B. The first coil 12B and the second coil 22B do not overlap each other in the thickness direction of the coil. In particular, since the first coil 12B has a circular shape and the second coil 22B has a rectangular shape, the distance (gap) between the first coil 12B and the second coil 22B in four corner portions of the second coil 22B is large.
In the coil unit according to Example 1, the second magnetic body 21B is also used as the guide member 21g. That is, the guide member 21g which is a guide portion is formed in the inner circumferential portion of the second magnetic body 21B.
Therefore, an inner hole of the second magnetic body 21B does not have a rectangular shape, but has a circular shape. An arc-shaped portion (see Section (B) of
As such, in the coil unit according to Example 1, the guide member 21g is formed in the inner circumferential portion of the second magnetic body 21B (on the side close to the first coil 12B). Therefore, it is possible to regulate a variation in the distance (gap) between the first coil 12B and the second coil 22B with a thickness that is substantially equal to that of the first coil 12B and to accurately position the first coil 12B and the second coil 22B.
In the coil unit according to Example 2, similarly to the coil unit according to Example 1, a first magnetic body 11B had a square shape with a side a of 40 mm, a first coil 12B had a circular shape with an outside diameter b of 29 mm, and the second magnetic body 21B had a shape in which a circle having an outside diameter d of 30 mm was cut out from a substantially central portion of a square with a side c of 40 mm. In addition, the coil unit had a thickness e of 1.0 mm.
In the coil unit according to Example 2, similarly to the coil unit according to Example 1, the guide member 21g is formed in an inner circumferential portion of the second magnetic body 21B and the guide member 30g is formed in an inner circumferential portion of the substrate 30C.
That is, an inner hole of the substrate 30C has a circular shape, similarly to the inner hole of the second magnetic body 21B. An arc-shaped portion which protrudes inward from four corners corresponding to the outer corners of the second magnetic body 21B to the center corresponds to the guide member 30g. As such, the guide members 30g and 21g guide the first coil 12B to a fixed position in the hole of the second magnetic body 21B, or they guide the hole of the second magnetic body 21B to a fixed position inside the first coil 12B. Therefore, a variation in the distance (gap) between the first coil 12B and the second coil 22B does not occur.
When the substrate 30C is also used as the guide member 30g, that is, when the guide member 30g is formed in the substrate 30C, the function of the guide member is obtained, without forming the guide member 21g in the second magnetic body 21B. However, in this case, it is preferable that the lower surface of the substrate 30C be disposed below the upper surface of the first coil 12B. In this case, it is possible to accurately position the distance (gap) between the first coil 12B and the second coil 22B.
As described above, since the inner circumferential portion of the substrate 30C is formed in the guide member 30g, it is easy to form the guide member and the guide member is simply formed in various shapes.
In the coil unit according to the comparative example, similarly to the coil unit according to Example 1 or 2, a first magnetic body 11 had a square shape with a side a of 40 mm, a first coil 12 had a circular shape with an outside diameter b of 29 mm, and a second magnetic body 21 had a shape in which a square having a side d of 30 mm was cut out from a square with a side c of 40 mm. In addition, the coil unit had a thickness e of 1.0 mm.
Since the comparative example is the same as the example (see Sections (A) to (D) of
As shown in Section (A) of
As shown in Section (B) of
Although not shown in each table in
As described above, in the coil unit according to the ninth embodiment, when the coil unit is assembled, the arrangement position of the first coil or the second coil is regulated such that the distance (gap) between the first coil and the second coil is fixed by the guide member. Therefore, the positional deviation between the first coil and the second coil does not occur and the gap between the first coil and the second coil is equal to or greater than a predetermined value. As a result, in the coil unit according to this embodiment, when wireless communication is performed by the second coil, the deterioration of the communication performance, particularly, a large variation in the resonance frequency can be prevented.
Sections (A) to (C) of
Section (A) of
In Section (B) of
In Section (C) of
In Section (D) of
Section (E) of
Section (F) of
It will be understood by those skilled in the art that various modifications or applications can be made on the basis of the specifications and the known technique, without departing from the scope and spirit of the invention, and are also included in the claims. In addition, the components according to the above-described embodiments may be arbitrarily combined with each other, without departing from the scope of the invention.
For example, in the above-described seventh to ninth embodiments, the guide member is formed as a portion of the second magnetic body or the substrate. However, the guide member may be formed separately from the second magnetic body or the substrate. In addition, the guide member may be made of the same material as that forming the second magnetic body or the substrate or it may be made of a material different from that forming the second magnetic body or the substrate. In this case, a new member is added to the coil unit, but it is possible to simply provide a guide member with an arbitrary shape, without changing the shape of the second magnetic body or the substrate.
The coil may have any shape, such as a rectangular shape, a circular shape, or an elliptical shape. The shape of the coil is not particularly limited.
In the above-described seventh to ninth embodiments, for ease of understanding, the coil unit is arranged in the up-down direction. However, the coil unit may be arranged in any direction such as the left-right direction.
The invention can reduce a size while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist and is useful as a non-contact wireless communication coil which can perform non-contact wireless communication in, for example, a portable phone terminal and a smart phone, and a portable wireless terminal including the non-contact wireless communication coil.
In addition, the invention can reduce a size and can be simply manufactured while preventing the performance deterioration of each coil when a plurality of coils, such as a non-contact wireless communication coil and a non-contact power transmission coil, coexist and is useful as a non-contact wireless communication coil which can perform non-contact wireless communication in, for example, a portable phone terminal and a smart phone, and a portable wireless terminal including the non-contact wireless communication coil.
Priority is claimed on Japanese Patent Application No. 2011-241255, filed on Nov. 2, 2011, Japanese Patent Application No. 2011-249841, filed on Nov. 15, 2011, Japanese Patent Application No. 2011-260677, filed on Nov. 29, 2011, Japanese Patent Application No. 2012-152664, filed on Jul. 6, 2012, and Japanese Patent Application No. 2012-154861, filed on Jul. 10, 2012, the content of which is incorporated herein by reference.
11, 11A, 11B: FIRST MAGNETIC BODY
12, 12A to 12N: FIRST COIL
21, 21A, 21B, 21C: SECOND MAGNETIC BODY
21g, 21h, 21i, 21j, 21k, 21l: GUIDE MEMBER
22, 22A to 22N: SECOND COIL
25: SPACER
30, 30A, 30B, 30C: SUBSTRATE
31: FIRST TERMINAL
32: SECOND TERMINAL
50: PORTABLE WIRELESS TERMINAL
51: NON-CONTACT CHARGING UNIT
52: NON-CONTACT WIRELESS COMMUNICATION UNIT
53: CONTROL CIRCUIT
55: RECTIFYING CIRCUIT
57: MODULATION/DEMODULATION CIRCUIT
58: BATTERY
60: CHARGER
61: AC POWER CIRCUIT
62: CONTROL CIRCUIT
63: NON-CONTACT POWER TRANSMISSION COIL
70: READER/WRITER DEVICE
71: MODULATION/DEMODULATION CIRCUIT
72: CONTROL CIRCUIT
73: NON-CONTACT WIRELESS COMMUNICATION COIL
Koyanagi, Yoshio, Uejima, Hiroyuki, Hirobe, Takanori
Patent | Priority | Assignee | Title |
10014577, | May 14 2012 | ZTE Corporation | Aerial module and mobile terminal device |
10256540, | Mar 23 2012 | NERA INNOVATIONS LIMITED | Antenna assembly and method for manufacturing same |
10266124, | Apr 28 2015 | Denso Corporation | Camera apparatus |
10306558, | Oct 22 2015 | Canon Kabushiki Kaisha | Power receiving apparatus for wirelessly receiving power from external apparatus |
10340725, | Aug 18 2014 | NERA INNOVATIONS LIMITED | Wireless power reception device |
10404107, | Sep 05 2012 | Renesas Electronics Corporation | Non-contact charging device, and non-contact power supply system using same |
10454171, | Feb 13 2018 | Samsung Electronics Co., Ltd. | Antenna coil apparatus and electronic device having coil antenna |
10651676, | Aug 18 2014 | NERA INNOVATIONS LIMITED | Wireless power reception device |
10673141, | Mar 23 2012 | NERA INNOVATIONS LIMITED | Antenna assembly and method for manufacturing same |
10804740, | Mar 23 2012 | NERA INNOVATIONS LIMITED | Wireless power receiver and method of manufacturing the same |
10923807, | Nov 05 2015 | AMOTECH CO , LTD | Combo type antenna module |
11456614, | Aug 18 2014 | NERA INNOVATIONS LIMITED | Wireless power reception device |
11539401, | Aug 31 2018 | AMOTECH CO , LTD | Combo antenna module |
11616395, | Jun 28 2012 | Sovereign Peak Ventures, LLC | Mobile terminal and chargeable communication module |
11728564, | Nov 27 2019 | AQ CORPORATION | Smartphone antenna in flexible PCB |
9941744, | May 09 2013 | TYCO ELECTRONICS SHANGHAI CO LTD | Non-contact power supply circuit |
Patent | Priority | Assignee | Title |
5198647, | Nov 28 1989 | Mitsubishi Denki Kabushiki Kaisha | Plural-coil non-contact IC card having pot cores and shielding walls |
5313444, | Nov 18 1991 | Sharp Kabushiki Kaisha | External magnetic field generation apparatus capable of light intensity modulation and magnetic field modulation |
6175212, | Oct 27 1998 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho; Toyota Jidosha Kabushiki Kaisha | Charging paddle |
6396241, | Sep 18 2000 | GM Global Technology Operations LLC | Inductive charging system employing a fluid-cooled transformer coil and transmission cable |
6625481, | Jun 06 1995 | Electrode assembly and method for signaling a monitor | |
6803744, | Nov 01 1999 | Alignment independent and self aligning inductive power transfer system | |
7042196, | May 13 2002 | PHILIPS IP VENTURES B V | Contact-less power transfer |
7271596, | Nov 19 2002 | LIVEWIRE INNOVATION, INC | Method and system for testing a signal path having an operational signal |
7948208, | Jun 01 2006 | MOJO MOBILITY, INC ; MOJO MOBILITY INC | Power source, charging system, and inductive receiver for mobile devices |
8009007, | Nov 26 2008 | Sanken Electric Co., Ltd. | Inductance part |
8055310, | Dec 16 2002 | PHILIPS IP VENTURES B V | Adapting portable electrical devices to receive power wirelessly |
8089245, | Jan 09 2007 | Sony Ericsson Mobile Communications Japan, Inc.; Seiko Epson Corporation | Noncontact charging device with temperature detection |
8188826, | May 14 2008 | 138 EAST LCD ADVANCEMENTS LIMITED | Coil unit and electronic apparatus using the same |
8193767, | Mar 24 2006 | Kabushiki Kaisha Toshiba; TOSHIBA MATERIALS CO , LTD | Power receiving device, and electronic apparatus and non-contact charger using the same |
8232764, | Mar 24 2006 | Kabushiki Kaisha Toshiba; TOSHIBA MATERIALS CO , LTD | Power receiving device, and electronic apparatus and non-contact charging system using the same |
8237401, | Dec 29 2008 | Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd.; Hon Hai Precision Industry Co., Ltd. | Recharging system and electronic device |
8260199, | Apr 04 2007 | NFC module, in particular for mobile phone | |
8269375, | Mar 26 2009 | SAMSUNG ELECTRONICS CO , LTD | Coil unit, and power transmission device and power reception device using the coil unit |
8280453, | Dec 16 2002 | PHILIPS IP VENTURES B V | Adapting portable electrical devices to receive power wirelessly |
8283888, | Jan 12 2006 | Kabushiki Kaisha Toshiba; TOSHIBA MATERIALS CO , LTD | Power receiver, and electronic apparatus and non-contact charger using same |
8362868, | Jul 04 2008 | Panasonic Corporation | Plane coil |
8421574, | Jun 20 2007 | Panasonic Corporation | Contactless power transmission apparatus and a method of manufacturing a secondary side thereof |
8457550, | Aug 19 2008 | Sony Corporation | Wireless communication device and power receiving device |
8541977, | Jul 20 2007 | SAMSUNG ELECTRONICS CO , LTD | Coil unit and electronic instrument |
8542018, | Mar 31 2009 | Fujitsu Limited | Power transmitting apparatus |
8547058, | Jan 26 2011 | Sovereign Peak Ventures, LLC | Non-contact charging module and reception-side and transmission-side non-contact charging apparatuses using the same |
8552684, | Jan 26 2011 | Sovereign Peak Ventures, LLC | Non-contact charging module and reception-side and transmission-side non-contact charging apparatuses using the same |
8560024, | Dec 16 2002 | PHILIPS IP VENTURES B V | Adapting portable electrical devices to receive power wirelessly |
8643219, | May 22 2008 | Mitsubishi Electric Corporation | Electronic equipment and method for connecting electronic circuit substrate |
8643473, | Mar 31 2010 | Sony Corporation | Signal processing apparatus and signal processing method |
8664801, | Apr 22 2009 | KONINKLIJKE PHILIPS N V | Non-contact power supply system |
8680811, | Mar 31 2008 | Panasonic Intellectual Property Corporation of America | Electronic device, charger, and electronic device charging system |
8766484, | Feb 22 2008 | PHILIPS IP VENTURES B V | Magnetic positioning for inductive coupling |
8829731, | Feb 22 2008 | PHILIPS IP VENTURES B V | Magnetic positioning for inductive coupling |
8847831, | Jul 03 2009 | Murata Manufacturing Co., Ltd. | Antenna and antenna module |
8909139, | Jan 27 2012 | Malikie Innovations Limited | Mobile wireless communications system including selectively coupled pair of discontinuous NFC circuit segments and related methods |
8922162, | Aug 08 2011 | Samsung Electronics Co., Ltd | Portable terminal having a wireless charger coil and an antenna element on the same plane |
8995910, | Apr 05 2012 | Rovi Guides, Inc | Antenna and mobile terminal having the same |
9048959, | Sep 21 2012 | Nokia Technologies Oy | Method and apparatus for a wireless optical link |
9126514, | Dec 21 2007 | CYNETIC DESIGNS LTD | Vehicle seat inductive charger and data transmitter |
9143041, | Feb 05 2010 | Hitachi Metals, Ltd | Magnetic circuit, power-supplying device and power-receiving device for non-contact charging apparatus, and non-contact charging apparatus |
9153855, | Aug 28 2009 | Sovereign Peak Ventures, LLC | Antenna, antenna unit, and communication device using them |
9240702, | Dec 21 2007 | CYNECTIC DESIGNS LTD. | Modular pocket with inductive power and data |
9265957, | Jul 01 2010 | Boston Scientific Neuromodulation Corporation | Implantable medical device and charging system employing electric fields |
9362985, | Nov 29 2010 | Fujitsu Limited | Portable apparatus and feed system |
20050116683, | |||
20050151696, | |||
20060076922, | |||
20060082659, | |||
20060205381, | |||
20070182367, | |||
20070206116, | |||
20070279022, | |||
20070297204, | |||
20080111518, | |||
20080122570, | |||
20080164839, | |||
20080164840, | |||
20080164844, | |||
20080297107, | |||
20080303735, | |||
20090001932, | |||
20090021212, | |||
20090033280, | |||
20090050624, | |||
20090058358, | |||
20090096413, | |||
20090102419, | |||
20090121677, | |||
20090212637, | |||
20090230777, | |||
20090284341, | |||
20100007215, | |||
20100127813, | |||
20100156344, | |||
20100156735, | |||
20100164431, | |||
20100181842, | |||
20100207575, | |||
20100210207, | |||
20100244579, | |||
20100244839, | |||
20100264746, | |||
20100270867, | |||
20100311327, | |||
20100320843, | |||
20110025264, | |||
20110043050, | |||
20110050535, | |||
20110102125, | |||
20110210619, | |||
20110210696, | |||
20110227799, | |||
20110241837, | |||
20110309792, | |||
20110316475, | |||
20120057322, | |||
20120098352, | |||
20120146580, | |||
20120153731, | |||
20120181876, | |||
20120289153, | |||
20120309307, | |||
20120319500, | |||
20120319647, | |||
20130005251, | |||
20130033118, | |||
20130038278, | |||
20130229252, | |||
20130249312, | |||
20130249661, | |||
20130267170, | |||
20140306656, | |||
20140349573, | |||
20150091524, | |||
20150222143, | |||
CN101681719, | |||
CN101771283, | |||
CN101971452, | |||
CN102017353, | |||
CN102084440, | |||
CN102208926, | |||
EP1928003, | |||
EP1944851, | |||
EP2017860, | |||
EP2081199, | |||
EP2172952, | |||
EP2244351, | |||
EP2246864, | |||
EP2258032, | |||
EP2284849, | |||
EP2296228, | |||
EP2348517, | |||
EP2367262, | |||
EP2456044, | |||
EP2546844, | |||
EP2620961, | |||
EP2712053, | |||
JP11122146, | |||
JP11265814, | |||
JP2002354713, | |||
JP2003045731, | |||
JP2003068531, | |||
JP2003255288, | |||
JP2004047701, | |||
JP2004110854, | |||
JP2005224603, | |||
JP2006032589, | |||
JP2006042519, | |||
JP2006126901, | |||
JP2006315368, | |||
JP2007214754, | |||
JP2008027015, | |||
JP2008125115, | |||
JP2008135589, | |||
JP2008172872, | |||
JP2008172874, | |||
JP2008205557, | |||
JP2008206297, | |||
JP2008210861, | |||
JP2008235860, | |||
JP2008289241, | |||
JP2009005475, | |||
JP2009027025, | |||
JP2009159660, | |||
JP2009182902, | |||
JP2009200174, | |||
JP2009247125, | |||
JP2009253649, | |||
JP2009259273, | |||
JP2009277820, | |||
JP2009284657, | |||
JP2010016235, | |||
JP2010041906, | |||
JP2010050515, | |||
JP2010128219, | |||
JP2010129692, | |||
JP2010207017, | |||
JP2010213570, | |||
JP2010219652, | |||
JP2010226929, | |||
JP2010239781, | |||
JP2010239838, | |||
JP2010252624, | |||
JP2010258913, | |||
JP2010259172, | |||
JP2010283263, | |||
JP2010284059, | |||
JP2011024360, | |||
JP2011049936, | |||
JP2011072074, | |||
JP2011072097, | |||
JP2011072116, | |||
JP2011101524, | |||
JP2011103533, | |||
JP2011103694, | |||
JP2011514796, | |||
JP2012010533, | |||
JP2012084893, | |||
JP2012156279, | |||
JP2012157147, | |||
JP2013021902, | |||
JP4400509, | |||
JP4669560, | |||
JP5013019, | |||
JP5144108, | |||
JP56170187, | |||
JP7231586, | |||
JP7299150, | |||
WO2007080820, | |||
WO2007122788, | |||
WO2008156025, | |||
WO2009053801, | |||
WO2009105615, | |||
WO2009114671, | |||
WO2011007661, | |||
WO2011016737, | |||
WO2011096569, | |||
WO2012073305, | |||
WO2013084480, |
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